| dc.description.abstract | techniques, applications of digital image process is no longer limited to
remote sensing or military purposes. Nowadays, researches in the field
of civil engineering utilize this technique. The technique of digital
image process and the incorporated relating software can help us
overcome the time-consuming and labor-intensive problem in analyzing
the aggregate structure of asphalt concrete. In the mean time, it offers a
rapid and objective quantitative analysis. Consequently, significant
parameters that can hardly be obtained from traditional experiments can
then be easily and accurately collected.
The objective of this study is mainly focused on examining the
particle shape characteristics of the coarse aggregates by digital image
analysis instead of the traditional way – which is more subjective. It’s
expected to reach the goal of time and labor saving without losing
accuracy. Thus, we can make a great deal of quantitative analysis
through digital image analysis. On the other hand, we can discuss
what’s the effect of changes of aggregate arrangement on mechanical
behavior of asphalt concrete. With various mechanical experiments, we
compare the differences of aggregate structures between Stone Mastic
Asphalt (SMA) and Dense-Graded Asphalt Concrete (DGAC). The
aggregate structures are then investigated by the engineering properties of
composition and macrocosm. Analyzing the test data, we conclude that
the composition of aggregates and their behavior of mechanics are closely
correlated, hence the micro quantitative parameters can be substituted forthe past macrocosm description.
The result reveals that application of the rapid and objective
quantitative image process on analysis of the shape of aggregate is
feasible. Meanwhile, important parameters, such as aggregate
orientation, obtained with the digital image process are also found
adequate to describe mechanical behavior of asphalt concrete.
Moreover, SMA is found, as other studies, to have better ability to resist
permanent deformation than DGAC as a result of the stone-on-stone
action. | en_US |